Comment 1 for bug 1858653

This currently raises a ValueError. Prior to the recent refactoring, it looks like this also failed with "Cannot get commit authorship for afb98a639b396e830e317b4f07f88a67a2d2c08c" immediately followed by a sys.exit(1).

As far as I can tell this changelog line will never have worked in the past. We need to specify how it should parse and then implement it.